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package com.sun.org.apache.xerces.internal.xs;

import java.util.Map;

/**
 * Objects implementing the XSNamedMap interface are used to
 * represent immutable collections of XML Schema components that can be
 * accessed by name. Note that XSNamedMap does not inherit from
 * XSObjectList. The XSObjects in
 * XSNamedMaps are not maintained in any particular order.
 */
public interface XSNamedMap extends Map {
    /**
     * The number of XSObjects in the XSObjectList.
     * The range of valid child object indices is 0 to length-1
     * inclusive.
     */
    public int getLength();

    /**
     *  Returns the indexth item in the collection or
     * null if index is greater than or equal to
     * the number of objects in the list. The index starts at 0.
     * @param index  index into the collection.
     * @return  The XSObject at the indexth
     *   position in the XSObjectList, or null if
     *   the index specified is not valid.
     */
    public XSObject item(int index);

    /**
     * Retrieves an XSObject specified by local name and
     * namespace URI.
     * 
Per XML Namespaces, applications must use the value null as the
     * namespace parameter for methods if they wish to specify
     * no namespace.
     * @param namespace The namespace URI of the XSObject to
     *   retrieve, or null if the XSObject has no
     *   namespace.
     * @param localName The local name of the XSObject to
     *   retrieve.
     * @return A XSObject (of any type) with the specified local
     *   name and namespace URI, or null if they do not
     *   identify any object in this map.
     */
    public XSObject itemByName(String namespace,
                               String localName);

}